Energy-saving and efficient sewage process system

Abstract

The utility model relates to the technical field of sewage treatment, aims to solve the problems of poorer sewage treatment effect and higher cost caused by medicament waste and energy consumption increase due to incapability of guiding the adding amount of a carbon source according to the actual condition of sewage when an existing sewage treatment system is used, and provides an energy-saving and high-efficiency sewage process system. Comprising a sewage treatment system, the sewage treatment system comprises an anaerobic tank, an anoxic tank, an aerobic tank and a membrane tank, and the tanks are sequentially communicated through pipelines; a water inlet end of the anaerobic tank is provided with a water inlet on-line monitoring system, a water outlet end of the membrane tank is provided with a water outlet on-line monitoring system, the water inlet on-line monitoring system is used for monitoring water inlet quality and water inlet quantity, and the water outlet on-line monitoring system is used for monitoring water outlet quality; the aerobic tank is connected with an air inlet device through an air inlet pipeline, and an air inlet adjusting valve is arranged on the air inlet pipeline; a dissolved oxygen measuring instrument is arranged in the aerobic tank; and the anaerobic tank is communicated with a carbon source dosing barrel.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field, specifically, relate to a sewage energy -efficient process system. BACKGROUND

[0002] In the operation cost of sewage plant, the main proportion is power consumption, reagent cost and sludge dewatering and sludge disposal cost. At present, many sewage treatment plants are still in extensive operation mode, for example: under the condition that the water concentration is not high (that is, the organic matter content in the influent is low), carbon source is always added, too much carbon source can lead to enhanced microbial metabolic activity, and more oxygen is needed, thereby increasing aeration quantity and energy consumption, when the carbon source is excessive, aeration is increased to handle, in this way, not only the reagent is excessive, the energy consumption is excessive, and the sludge treatment and disposal are also excessive, then, the operation cost of the whole sewage plant will increase. On the surface, the excessive addition of carbon source is the reason for the increase of energy consumption and sludge disposal cost, but essentially, the addition amount of carbon source is controlled according to the monitoring data of influent and effluent quality and the dissolved oxygen value in the aerobic system, for example, when the influent COD is high, because the organic matter content in the sewage is relatively high, therefore, little or no external carbon source is needed to maintain the metabolic activity of microorganisms in the system, when the effluent COD is low, it indicates that the treatment effect is good, when the influent ammonia nitrogen is high, more carbon source is needed to promote the denitrification process, when the effluent ammonia nitrogen is low, it indicates that the ammonia nitrogen removal effect is good, too low dissolved oxygen in the aerobic system will lead to decreased microbial activity, affecting the degradation of organic matter and the removal of nitrogen, too high dissolved oxygen in the aerobic system will increase energy consumption, and may lead to sludge aging. Therefore, the monitoring of aerobic system parameters and the reflection of online monitoring values of influent and effluent are the basis for controlling operation cost. CONTENT

[0003] The utility model aims at providing a kind of sewage energy -efficient process system, to solve the problem that the carbon source addition amount cannot be guided according to the actual situation of sewage when using the existing sewage treatment system, leading to reagent waste and increasing energy consumption, thereby leading to poor sewage treatment effect and large cost.

[0004] The utility model is implemented by the following technical solutions:

[0005] The utility model provides a kind of sewage energy -efficient process system, including sewage treatment system, the sewage treatment system includes anaerobic tank, anoxic tank, aerobic tank and membrane pool, the anaerobic tank, the anoxic tank, the aerobic tank and the membrane pool are sequentially communicated by pipeline between the anaerobic tank, the anoxic tank, the aerobic tank and the membrane pool;

[0006] The water inlet end of the anaerobic tank is provided with a water inlet online monitoring system, the water outlet end of the membrane tank is provided with a water outlet online monitoring system, the water inlet online monitoring system is used for monitoring water quality and water inlet quantity, and the water outlet online monitoring system is used for monitoring water quality;

[0007] The aerobic tank is connected with an air inlet device through an air inlet pipeline, an air inlet adjusting valve is arranged on the air inlet pipeline, and the air inlet adjusting valve is used for adjusting the air inlet quantity of the aerobic tank.

[0008] A dissolved oxygen measuring instrument is arranged in the aerobic tank, and the dissolved oxygen measuring instrument is used for measuring the dissolved oxygen quantity of the aerobic tank.

[0009] The anaerobic tank is communicated with a carbon source dosing barrel, and the carbon source dosing barrel is used for carbon source addition.

[0010] As a preferred technical scheme:

[0011] The membrane tank is an MBR membrane tank.

[0012] As a preferred technical scheme:

[0013] The anaerobic tank, the anoxic tank, the aerobic tank and the membrane tank are provided with a reverse communication device, and the reverse communication device is used for sequentially and reversely communicating the membrane tank, the aerobic tank, the anoxic tank and the anaerobic tank.

[0014] As a preferred technical scheme:

[0015] The reverse communication device includes a membrane tank backflow pump, a nitrification liquid backflow pump and a sludge backflow pump, the membrane tank backflow pump is arranged in the membrane tank, the membrane tank backflow pump is used for reversely communicating the membrane tank and the aerobic tank, the nitrification liquid backflow pump is arranged in the aerobic tank, the nitrification liquid backflow pump is used for reversely communicating the aerobic tank and the anoxic tank, and the sludge backflow pump is arranged in the anoxic tank, and the sludge backflow pump is used for reversely communicating the anoxic tank and the anaerobic tank.

[0016] As a preferred technical scheme:

[0017] The air inlet device adopts a fan, the fan is a variable frequency fan, and the fan is provided with a frequency converter.

[0018] The frequency converter can change the frequency of the fan, so as to change the aeration quantity of the aerobic tank.

[0019] As a preferred technical scheme:

[0020] A flow meter is further arranged on the air inlet pipeline, and the flow meter is used for measuring the air inlet quantity of the aerobic tank.

[0021] As a preferred technical scheme:

[0022] The intake adjusting valve is an electric adjusting valve, and the flow meter is a vortex flow meter.

[0023] As a preferred technical solution:

[0024] The water inlet online monitoring system comprises a water inlet online monitoring device and a water inlet electromagnetic flow meter, both of which are arranged on a water inlet pipeline connected with the anaerobic tank, the water inlet online monitoring device is used for monitoring water quality, and the water inlet electromagnetic flow meter is used for measuring water inlet quantity.

[0025] As a preferred technical solution:

[0026] The water inlet online monitoring device can adopt a TH-ZS07 integrated sewage multi-parameter detector.

[0027] As a preferred technical solution:

[0028] The water outlet online monitoring system comprises a water outlet online monitoring device, which is arranged on a water outlet pipeline connected with the membrane tank, and is used for monitoring water outlet quality.

[0029] As a preferred technical solution:

[0030] The water outlet online monitoring device can adopt a SH500-H5B-6C integrated sewage multi-parameter detector.

[0031] As a preferred technical solution:

[0032] The sewage energy-saving and efficient process system further comprises a control device, which is electrically connected with the water inlet online monitoring device, the water inlet electromagnetic flow meter, the electric adjusting valve, the vortex flow meter, the water outlet online monitoring device, the dissolved oxygen measuring instrument and the carbon source dosing barrel.

[0033] The control device controls whether the carbon source dosing barrel adds carbon source and the adding amount, and controls the opening degree of the electric adjusting valve according to the data monitored by the water inlet online monitoring system and the water outlet online monitoring system and the data measured by the dissolved oxygen measuring instrument, so as to avoid excessive carbon source addition, change the air inlet quantity of the aerobic tank, avoid excessive or insufficient dissolved oxygen in the aerobic tank, avoid insufficient dissolved oxygen to reduce microbial activity and affect organic matter degradation and nitrogen removal, and avoid excessive dissolved oxygen to increase energy consumption and cause sludge aging.

[0034] As a preferred technical solution:

[0035] The control device adopts a PLC control cabinet.

[0036] As a preferred technical solution:

[0037] The film pool is also connected with an air inlet device, and the air inlet device also adopts a fan.

[0038] In summary, due to the adoption of the above technical solution, the beneficial effects of the present application are:

[0039] 1、The present application monitors and collects the water quality data, water inflow and water quality data of water outflow through the water inflow online monitoring equipment, water inflow electromagnetic flowmeter and water outflow online monitoring equipment, and the staff can determine the current sewage treatment condition according to the collected water quality data, so as to guide the adjustment of carbon source dosage accordingly. For example, when the system is normally operated and the water inflow is stable, the carbon source dosage remains unchanged, when the water inflow COD decreases, the carbon source dosage is increased, when the water inflow COD increases, the carbon source dosage is reduced, and the sewage treatment effect is determined according to the water quality data of water outflow, and the carbon source dosage is increased or reduced according to the sewage treatment effect, which not only ensures that the water outflow meets the standard, but also controls the carbon source dosage within a reasonable range, avoiding excessive addition.

[0040] 2、The present application monitors and collects the dissolved oxygen content in the aerobic tank through the dissolved oxygen measuring instrument, and changes the aeration amount of the aerobic tank through the fan frequency converter and the electric regulating valve, so as to change the dissolved oxygen content in the aerobic tank, so that the dissolved oxygen content in the aerobic tank reaches the conventional dissolved oxygen value. Under the conventional dissolved oxygen value, the system not only ensures the degradation of organic matter and the removal of nitrogen, ensures that the water outflow meets the standard, but also ensures that the dissolved oxygen will not be too high, reduces energy consumption, and avoids causing sludge aging. The conventional dissolved oxygen value can be set according to the water quality data, water inflow and water quality data of water outflow when the system is normally operated and the water inflow is stable.

[0041] 3、The present application can also adjust the opening degree of the electric regulating valve or add carbon source according to the change of water inflow and water concentration, so that the dissolved oxygen content of the aerobic tank reaches the conventional dissolved oxygen value, and the water outflow meets the standard. In this process, the carbon source dosage can be effectively controlled to avoid excessive carbon source addition and energy waste.

[0042] 4、The present application can reduce energy consumption by 10% to 30% by monitoring and controlling the dissolved oxygen content of the aerobic tank.

[0043] 5、The present application can adjust the system process operation in advance according to the change of water inflow and outflow quality by increasing the water inflow and outflow online monitoring system.

[0044] 6、Although the present application increases some equipment and investment cost, the power consumption, carbon source dosage and sludge disposal amount of the whole system are greatly reduced, and the economic benefit of the sewage plant is improved as a whole.

[0045] 7. The utility model discloses a multistage backflow mode, sewage or sludge is backflowed from MBR membrane pool to aerobic tank first, then is backflowed from aerobic tank to anoxic tank, and then is backflowed from anoxic to anaerobic tank, and multistage backflow can avoid that the dissolved oxygen concentration of anaerobic tank is too high, and influence anaerobic phosphorus removal effect. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 The utility model discloses a structure diagram of sewage energy -efficient process system.

[0047] Figure: 1, anaerobic tank, 2, anoxic tank, 3, aerobic tank, 4, MBR membrane pool, 5, water inlet on -line monitoring equipment, 6, water inlet electromagnetic flowmeter, 7, PLC control cabinet, 8, electric regulating valve, 9, vortex flowmeter, 10, membrane pool backflow pump, 11, nitrification liquid backflow pump, 12, sludge backflow pump, 13, water outlet on -line monitoring equipment, 14, carbon source dosing barrel, 15, communication line, 16, fan. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clear, the technical scheme in the utility model embodiment will be clearly and completely described below with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of protection of the utility model.

[0049] Embodiment 1

[0050] As Figure 1 The utility model discloses a sewage energy -efficient process system, including sewage treatment system, the sewage treatment system adopts the A2O+MBR process of existing, and this process is through the separation effect of the activity of microorganism and membrane filtration, and the organic matter and nitrogen phosphorus and other pollutants in waste water are removed efficiently.

[0051] The sewage treatment system includes anaerobic tank 1, anoxic tank 2, aerobic tank 3 and MBR membrane pool 4, and the anaerobic tank 1, anoxic tank 2, aerobic tank 3 and MBR membrane pool 4 are sequentially communicated through the pipeline.

[0052] The water inlet end of anaerobic tank 1 is provided with a water inlet on-line monitoring system, and the water outlet end of MBR membrane pool 4 is provided with a water outlet on-line monitoring system, the water inlet on-line monitoring system is used for monitoring water quality and water inlet quantity, and the water outlet on-line monitoring system is used for monitoring water quality.

[0053] The outside of anaerobic tank 1 is provided with two groups of fans 16, and the two groups of fans 16 are connected with aerobic tank 3 and MBR membrane pool 4 through ventilation pipelines respectively, and the two groups of fans 16 are used for supplying air for aerobic tank 3 and MBR membrane pool 4 respectively.

[0054] The ventilation pipeline connected with the aerobic tank 3 is provided with an electric regulating valve 8, and the electric regulating valve 8 can control the air intake of the aerobic tank 3. The ventilation pipeline connected with the aerobic tank 3 is also provided with a vortex flowmeter 9, and the vortex flowmeter 9 can measure the air intake provided by the fan 16 for the aerobic tank 3.

[0055] The aerobic tank 3 is provided with a dissolved oxygen measuring instrument, which is used to measure the dissolved oxygen content in the aerobic tank 3.

[0056] The fan 16 corresponding to the aerobic tank 3 is a variable frequency fan, which is provided with a frequency converter. By changing the frequency of the frequency converter, the aeration amount of the fan 16 can be adjusted.

[0057] The inside of the anaerobic tank 1 is communicated with a carbon source dosing barrel 14, which is used to add carbon source to the anaerobic tank 1.

[0058] In this embodiment, the influent online monitoring system includes an influent online monitoring device 5 and an influent electromagnetic flowmeter 6, both of which are arranged on the influent pipeline connected with the anaerobic tank 1. The influent online monitoring device 5 is used to monitor the influent water quality, and the influent electromagnetic flowmeter 6 is used to measure the influent amount. The influent online monitoring device 5 can adopt a type TH-ZS07 integrated sewage multi-parameter detector.

[0059] The effluent online monitoring system includes an effluent online monitoring device 13, which is arranged on the effluent pipeline connected with the MBR membrane tank 4. The effluent online monitoring device 13 is used to monitor the effluent water quality, and the effluent online monitoring device 13 can adopt a type SH500-H5B-6C integrated sewage multi-parameter detector.

[0060] Further, in order to solve the problem that the sewage or sludge in the MBR membrane tank 4 directly returns to the anaerobic tank 1, causing the dissolved oxygen in the anaerobic tank 1 to be too high, a reverse communication device is arranged between the anaerobic tank 1, the anoxic tank 2, the aerobic tank 3 and the MBR membrane tank 4. The reverse communication device includes a membrane tank return pump 10, a nitrification liquid return pump 11 and a sludge return pump 12. The membrane tank return pump 10 is arranged inside the MBR membrane tank 4, and is used to reversely communicate the MBR membrane tank 4 with the aerobic tank 3. The nitrification liquid return pump 11 is arranged inside the aerobic tank 3, and is used to reversely communicate the aerobic tank 3 with the anoxic tank 2. The sludge return pump 12 is arranged inside the anoxic tank 2, and is used to reversely communicate the anoxic tank 2 with the anaerobic tank 1.

[0061] The anaerobic tank 1 is externally provided with a PLC control cabinet 7, the PLC control cabinet 7 is electrically connected with each electric equipment through a communication line 15, for example, the PLC control cabinet 7 is connected with the water inlet on-line monitoring equipment 5, the water inlet electromagnetic flowmeter 6, the electric regulating valve 8, the vortex flowmeter 9, the water outlet on-line monitoring equipment 13 and the dissolved oxygen measuring instrument.

[0062] In one aspect, the water inlet on-line monitoring equipment 5, the water inlet electromagnetic flowmeter 6 and the water outlet on-line monitoring equipment 13 are used to monitor and collect water quality data, water inlet quantity and water outlet quality data, and the staff can judge the current sewage treatment condition according to the collected water quality data, so that the carbon source adding amount can be adjusted accordingly.For example, when the system is normally operated and the water inlet is stable, the carbon source adding amount remains unchanged, when the water inlet COD decreases, the carbon source adding is increased, when the water inlet COD increases, the carbon source adding is reduced, and whether the sewage treatment effect under the current adding amount meets the requirements or whether the carbon source amount needs to be increased or reduced is judged according to the water outlet quality data, that is, the carbon source adding is increased or reduced according to the sewage treatment effect, which not only can ensure that the water outlet meets the standards, but also can control the carbon source adding amount within a reasonable range, and over-addition can be avoided.

[0063] In another aspect, the utility model discloses through the dissolved oxygen measuring instrument monitoring and gathering the dissolved oxygen content in the aerobic tank 3, can according to the water quality data of system normal operation and when the water inlet is stable, the water inlet and the water quality data of setting routine dissolved oxygen value, the routine dissolved oxygen value is the best dissolved oxygen value under the condition that system normal operation and when the water inlet is stable, the water reaches the standard, the setting method of this routine dissolved oxygen value is: when system normal operation and when the water inlet is stable, adjust the frequency converter of fan and electric regulating valve 8 to change the aeration quantity of aerobic tank 3, simultaneously observe whether the water quality data reaches the standard, if still reaches the standard, then continue to adjust the opening of electric regulating valve 8, until the water quality data of water appears fluctuation close to the substandard boundary, after the water quality of water is stable and reaches the standard, stop the air adjustment opening of electric regulating valve 8, observe the value of dissolved oxygen measuring instrument in aerobic tank 3 and record, set it as routine dissolved oxygen value. System under routine dissolved oxygen value, not only can guarantee the degradation of organic matter and the removal of ammonia nitrogen, guarantee the water reaches the standard, but also can guarantee that the dissolved oxygen does not overhigh, reduces the energy consumption, and avoids leading to sludge aging, when system normal operation and when the water inlet is stable, the dissolved oxygen content of aerobic tank 3 keeps near routine dissolved oxygen value, carbon source dosage keeps unchanged at this time, when the water inlet and the water concentration (the organic matter content in water) increase, the dissolved oxygen content of aerobic tank 3 reduces, first reduces carbon source dosage, looks whether the dissolved oxygen content of aerobic tank 3 can reach target value, if not, then increase the opening of electric regulating valve 8, make the dissolved oxygen content of aerobic tank 3 close to or equal to routine dissolved oxygen value, when the water inlet reduces, the dissolved oxygen content of aerobic tank 3 increases, and the opening of electric regulating valve 8 is adjusted, and the dissolved oxygen content of aerobic tank 3 is close to or equal to routine dissolved oxygen value, if the water concentration (the organic matter content in water) reduces, then a small amount of carbon source is added through carbon source dosing barrel 14, promotes the growth and reproduction of microorganism, simultaneously observes the dissolved oxygen content value and the water quality data of aerobic tank 3, makes the dissolved oxygen content of aerobic tank 3 close to or equal to routine dissolved oxygen value, simultaneously guarantees the water reaches the standard, according to the above mode, carbon source dosage is more accurate, but the amount.

[0064] Further, for the convenience of adding, carbon source dosing barrel 14 can be connected to PLC control cabinet 7, and the addition is carried out by PLC control cabinet 7 according to the foregoing mode.

[0065] When working, sewage first enters anaerobic tank 1 through water inlet online monitoring equipment 5 and water inlet electromagnetic flowmeter 6, and the data of water inlet online monitoring equipment 5 and water inlet electromagnetic flowmeter 6 are fed back to the control system of PLC control cabinet 7 through 485 communication technology and displayed.

[0066] Then the sewage enters anoxic tank 2, aerobic tank 3 and MBR membrane tank 4 in turn, in order to solve the problem that the sewage or sludge in MBR membrane tank 4 directly returns to anaerobic tank 1, causing the dissolved oxygen in anaerobic tank 1 to be too high, a multi-stage reflux mode is adopted, MBR membrane tank 4 first returns to aerobic tank 3, then returns to anoxic tank 2 from aerobic tank 3, and then returns to anaerobic tank 1 from anoxic tank 2.

[0067] On one hand, the staff or the PLC control cabinet 7 can judge the present sewage treatment condition according to the collected water quality data, so as to adjust the carbon source dosage in a targeted manner; on the other hand, the staff or the PLC control cabinet 7 can adjust the opening of the electric regulating valve 8 or add the carbon source according to the change of the influent quantity and the influent concentration, so that the dissolved oxygen quantity of the aerobic tank 3 reaches the conventional dissolved oxygen value, and the effluent reaches the standard.

[0068] The effluent of the MBR membrane tank 4 is finally discharged after being monitored to reach the standard by the effluent online monitoring equipment 13, and the data monitored by the effluent online monitoring equipment 13 is transmitted to the PLC control cabinet 7 and displayed.

[0069] According to the automatic recording report system of the sewage plant, the influent quantity, the influent and effluent water quality data, the power consumption, the fan 16 air volume and other parameters of the sewage plant every day are read and analyzed.

[0070] The utility model discloses on the basis of original A2O+MBR membrane process system, increased the influent and effluent online monitoring system for monitoring the influent and effluent water quality situation, and feedback to PLC system through 485 communication technology, specifically, the influent online monitoring system passes through communication line 15 and transmits information to PLC control cabinet 7, and the effluent online monitoring system passes through communication line 15 and transmits information to PLC control cabinet 7.

[0071] The utility model adds the dissolved oxygen control system (i.e. fan frequency converter and electric regulating valve 8), makes the dissolved oxygen that the dissolved oxygen measuring instrument determines in the aerobic tank 3 can keep certain constant value (conventional dissolved oxygen value), avoids the dissolved oxygen in the aerobic tank 3 and is too high or too low, avoids the dissolved oxygen and too low and leads to the microbial activity to drop, influences the degradation of organic matter and the removal of ammonia nitrogen, avoids the dissolved oxygen and too high and increases the energy consumption, leads to sludge aging.

[0072] The utility model determines the most suitable conventional dissolved oxygen value according to the dissolved oxygen quantity of the aerobic tank 3 and the influent and effluent water quality index, for example, when the conventional dissolved oxygen value is at 2mg / L, the system shows the COD value less than 10mg / L and the ammonia nitrogen value less than 0.2mg / L under the condition that the influent COD average value is 70~130mg / L and the ammonia nitrogen average value is at 7~20mg / L, the running result shows that under the condition that the influent water quality and the influent quantity fluctuate little, the process system can stably and efficiently run, the average power consumption is 497KW·h before the transformation, the average power consumption is 427KW·h after the transformation, the average power consumption is saved 70KW·h, and the energy consumption is reduced by 10%~30%; the COD removal can reach 92.3%, and the ammonia nitrogen removal rate reaches 99%. According to the influent water quality and the effluent water quality, the carbon source dosage can be pre-adjusted.

[0073] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An energy-saving and efficient sewage treatment system, characterized in that: a sewage treatment system is comprised, the sewage treatment system comprises an anaerobic tank, an anoxic tank, an aerobic tank and a membrane tank, and the anaerobic tank, the anoxic tank, the aerobic tank and the membrane tank are sequentially communicated through pipelines; an online water inlet monitoring system is arranged at the water inlet end of the anaerobic tank, an online water outlet monitoring system is arranged at the water outlet end of the membrane tank, the online water inlet monitoring system is used for monitoring water inlet quality and water inlet quantity, and the online water outlet monitoring system is used for monitoring water outlet quality; the aerobic tank is connected with an air inlet device through an air inlet pipeline, an air inlet adjusting valve is arranged on the air inlet pipeline, and the air inlet adjusting valve is used for adjusting air inlet quantity of the aerobic tank; a dissolved oxygen measuring instrument is arranged in the aerobic tank, and the dissolved oxygen measuring instrument is used for measuring dissolved oxygen quantity of the aerobic tank; the anaerobic tank is connected with a carbon source dosing barrel, and the carbon source dosing barrel is used for carbon source addition.

2. The energy-saving and efficient sewage treatment system according to claim 1, characterized in that: reverse communication devices are arranged between the anaerobic tank, the anoxic tank, the aerobic tank and the membrane tank, and the reverse communication devices are used for sequentially reversely communicating the membrane tank, the aerobic tank, the anoxic tank and the anaerobic tank.

3. The energy-saving and efficient sewage treatment system according to claim 2, characterized in that: the reverse communication devices comprise a membrane tank backflow pump, a nitrification liquid backflow pump and a sludge backflow pump, the membrane tank backflow pump is arranged in the membrane tank, and is used for reversely communicating the membrane tank and the aerobic tank; the nitrification liquid backflow pump is arranged in the aerobic tank, and is used for reversely communicating the aerobic tank and the anoxic tank; and the sludge backflow pump is arranged in the anoxic tank, and is used for reversely communicating the anoxic tank and the anaerobic tank.

4. The energy-saving and efficient sewage treatment system according to claim 1, characterized in that: the air inlet device adopts a fan, the fan is a variable frequency fan, and the fan is configured with a frequency converter.

5. The energy-saving and efficient sewage treatment system according to claim 1, characterized in that: a flowmeter is further arranged on the air inlet pipeline, and the flowmeter is used for measuring air inlet quantity of the aerobic tank.

6. The energy-saving and efficient sewage treatment system according to claim 5, characterized in that: the air inlet adjusting valve adopts an electric adjusting valve, and the flowmeter adopts a vortex flowmeter.

7. The energy-saving and efficient sewage treatment system according to claim 6, characterized in that: the online water inlet monitoring system comprises an online water inlet monitoring device and a water inlet electromagnetic flowmeter, the online water inlet monitoring device and the water inlet electromagnetic flowmeter are both arranged on a water inlet pipeline connected with the anaerobic tank, the online water inlet monitoring device is used for monitoring water inlet quality, and the water inlet electromagnetic flowmeter is used for measuring water inlet quantity.

8. The energy-saving and efficient sewage treatment system according to claim 7, characterized in that: the online water outlet monitoring system comprises an online water outlet monitoring device, the online water outlet monitoring device is arranged on a water outlet pipeline connected with the membrane tank, and the online water outlet monitoring device is used for monitoring water outlet quality. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 9. The sewage energy-saving efficient process system according to claim 8, characterized in that: It further comprises a control device, which is electrically connected with the water inlet online monitoring equipment, the water inlet electromagnetic flowmeter, the electric regulating valve, the vortex flowmeter, the water outlet online monitoring equipment, the dissolved oxygen measuring instrument and the carbon source dosing barrel.

10. The sewage energy-saving efficient process system according to claim 9, characterized in that: The control device adopts a PLC control cabinet.

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